Simple MSTP ring setup help

[dray]

I am trying to setup a simple ring with MSTP. I want the untagged management vlan blocked on one port and pick one path over the other. And then I have a vlan between two netonix on one link I never want blocked. I can get RSTP working and blocking what I need. When I setup MSTP, I can not keep the vlans passing. I setup the names and revision number on all the switches to the same. I select ports on CIST. I have tried setting up instance 1 on just the two netonix with the vlan, and also vlan 1 in instance 1 on all switches and then instance 2 with the vlan. The vlan always gets blocked along with the port/untagged. Can I get some help with this config? When I select the instances, it shows what is blocking and forwarding per instance correct? I see an enable on the instaces pages but cant enable per port or save. Is this normal?

[mike99]

Please post the 2 switch config for both instance and don't hide name.

[dray]

two switches. vlan 30 tagged on port one only.

[mike99]

Try unpriorize on both switchs.
Could do the same with cost that also affect choosen path but in an other way.

Which firmware version ? Are you up to date with last RC ? The're was some fix added to 1.9rc1 for MSTP, don't know since then, but I didn't have much to time but, from what I remember, it seemed to behavior ok starting with this version but I didn't tested much.

[dray]

I am on the latest. Can anyone provide a simple example how this is supposed to work?

[sirhc]

Well our switches support STP, RSTP, and MSTP "standards"

STP = IEEE 802.1D
RSTP = IEEE 802.1w
MSTP = IEEE 802.1s as an amendment to 802.1Q, 1998 edition and later merged into IEEE 802.1Q-2005

MSTP works the same across all switches no matter who makes the switch as it is a standard.

Since our switches follow the standard there is plenty of documentation on the protocols readily available on the net.

You can start here: https://en.wikipedia.org/wiki/Multiple_ ... e_Protocol

[dray]

Chris, do you see a problem with my config?

[mike99]

You should explain what you want to do first.

From what I see, you only changed priority in CIST. You must set a lower priority or lower cost on port you want STP to choose and do it on both switch.

If you want instannce 1 to pass through port 1, then set a lower priority or lower cost on this port on both switch. You can also set an higher priority or cost on port 2 instead.

You should read on priority and cost but in larger network, cost is a better option while priority is fine if you want to control the behavior only between 2 switch.